I'm trying to get my bearings with this issue. My 80's original from 1992 1hz motor is near 670 k km's. It runs ok, but not awesome. I have no knowledge of or documentation to suggest that the motor has ever had the head removed/replaced. I've done some work to the motor as deep as doing valve shims but never pulled the head or inspected anything more internal.
I know that new 1hz heads are pricey and good remanufactured/refurbed exchange heads are not much cheaper.
I also know one of the big things with 1hz's is they are prone to micro-fine head cracking and cracked pre-combustion chambers. My motor has never been turbo'd as far as I know. It had reconditioned injectors and injector pump fitted about 8 years ago (around 520 k km's).
In my stock of bits I do actually have a full set of new genuine 1hz injectors that I could fit (and wouldn't hurt if I did).
So most opinions I get are saying it's not worth investing the time/money for a new head on a quite old motor but it is a job I could so myself so labour cost wise there's be zero impost (just the cost of my beer and parts).
An import 1hdt motor from Japan with unknown km's is going to cost me around A$8k at retail pricing, or a 1hdft A$10k up.
There was a rumour a while back that a Sydney-based Toyota dealership had new crate 1hdt motors available for about A$15k each, but that money is not falling off any trees near me.
So what are your views on the idea of replacing the head (motor will be due for timing belt, tensioner and new water pump soon anyway), leaving the head and just going with the new injectors, or biting the bullet and getting a whole replacement motor (even if just a reco/refurb/reman 1hz not a turbo)?
Craig.
I know that new 1hz heads are pricey and good remanufactured/refurbed exchange heads are not much cheaper.
I also know one of the big things with 1hz's is they are prone to micro-fine head cracking and cracked pre-combustion chambers. My motor has never been turbo'd as far as I know. It had reconditioned injectors and injector pump fitted about 8 years ago (around 520 k km's).
In my stock of bits I do actually have a full set of new genuine 1hz injectors that I could fit (and wouldn't hurt if I did).
So most opinions I get are saying it's not worth investing the time/money for a new head on a quite old motor but it is a job I could so myself so labour cost wise there's be zero impost (just the cost of my beer and parts).
An import 1hdt motor from Japan with unknown km's is going to cost me around A$8k at retail pricing, or a 1hdft A$10k up.
There was a rumour a while back that a Sydney-based Toyota dealership had new crate 1hdt motors available for about A$15k each, but that money is not falling off any trees near me.
So what are your views on the idea of replacing the head (motor will be due for timing belt, tensioner and new water pump soon anyway), leaving the head and just going with the new injectors, or biting the bullet and getting a whole replacement motor (even if just a reco/refurb/reman 1hz not a turbo)?
Craig.